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Full example D3 that shows the lifecycle of charts including: selection, implicit update, enter() and exit()
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <button id="heybutton" onclick="clickme()">Update</button> | |
| <script id="jsbin-javascript"> | |
| //Full example D3 that shows the lifecycle of charts: | |
| //Selection: Update, Enter, and Exit | |
| var maxSize = 20; | |
| var maxLen = 11; | |
| var gridSize = 25; | |
| var a = getRandData(maxLen); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", 300) | |
| .attr("height", 150); | |
| drawChart(a); | |
| function drawChart(data) { | |
| var circle = svg.selectAll("circle") | |
| .data(data); | |
| //The exit selection - these items don't exist in the new dataset so they should be removed | |
| //Does not seem to matter where in this sequence the exit() selection is (whether before/after append() or update) | |
| circle.exit().transition().duration(1000).attr("r", 0).remove(); | |
| //The enter selection - place for handling items not already in the dataset | |
| //This part needs to be before the implicit update selection below | |
| circle.enter().append("circle") | |
| .transition().duration(1000) | |
| .attr("r", 2.5); | |
| //Implicit update selection - these are items that already exist, but may have new data | |
| circle | |
| .transition().duration(1000) | |
| .attr("cx", function(d, i) { | |
| return gridSize * d.index + gridSize; | |
| }) | |
| .attr("r", function(d) { | |
| return (d.size / maxSize) * maxSize; | |
| }) | |
| .attr("cy", 60); | |
| } | |
| function removeRandomData(newdata) { | |
| var newArr = []; | |
| var pctToRemove = 0.25; | |
| newdata.forEach(function(d) { | |
| if (pctToRemove < Math.random()) { | |
| newArr.push(d); | |
| } | |
| }); | |
| return newArr; | |
| } | |
| function getRandData(num) { | |
| var arr = []; | |
| for (var i = 0; i < num; i++) { | |
| arr.push({ | |
| "size": parseInt(Math.random() * maxSize), | |
| "index": i | |
| }); | |
| } | |
| return arr; | |
| } | |
| function clickme() { | |
| var newdata = getRandData(maxLen); | |
| newdata = removeRandomData(newdata); | |
| drawChart(newdata); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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